| Extension | File Description |
| .DH4 | Uncommon Files |
| .DH5 | Uncommon Files |
| .DH6 | Uncommon Files |
| .DH7 | Uncommon Files |
| .DH8 | Uncommon Files |
| .DH9 | Uncommon Files |
| .DHA | Uncommon Files |
| .DHB | Uncommon Files |
| .DHC | Uncommon Files |
| .DHCD | Data Files |
| .DHD | Uncommon Files |
| .DHE | Uncommon Files |
| .DHF | Uncommon Files |
| .DHG | Uncommon Files |
| .DHH | Uncommon Files |
| .DHI | Uncommon Files |
| .DHJ | Uncommon Files |
| .DHK | Uncommon Files |
| .DHL | Uncommon Files |
| .DHM | Uncommon Files |
| .DHN | Uncommon Files |
| .DHO | Uncommon Files |
| .DHP | Uncommon Files |
| .DHQ | Uncommon Files |
| .DHR | Uncommon Files |
| .DHRP | Uncommon Files |
| .DHS | Uncommon Files |
| .DHT | Uncommon Files |
| .DHU | Uncommon Files |
| .DHV | Uncommon Files |
| .DHW | Uncommon Files |
| .DHX | Uncommon Files |
| .DHY | Uncommon Files |
| .DHZ | Uncommon Files |
| .DI | Uncommon Files |
| .DI0 | Uncommon Files |
| .DI1 | Uncommon Files |
| .DI2 | Uncommon Files |
| .DI3 | Uncommon Files |
| .DI4 | Uncommon Files |
| .DI5 | Uncommon Files |
| .DI6 | Uncommon Files |
| .DI7 | Uncommon Files |
| .DI8 | Uncommon Files |
| .DI9 | Uncommon Files |
| .DIA | Data Files |
| .DIABLOFONT | Uncommon Files |
| .DIALLIST | Uncommon Files |
| .DIALOG | Uncommon Files |
| .DIALOGUE | Uncommon Files |
| .DIAMONDS | Uncommon Files |
| .DIB | Raster Image Files |
| .DIC | Misc Files |
| .DICM | Uncommon Files |
| .DICOM | Raster Image Files |
| .DICPROOF | Settings Files |
| .DICT | Uncommon Files |
| .DICTIONARY | Uncommon Files |
| .DID | Uncommon Files |
| .DIE | Uncommon Files |
| .DIE-AGAIN | Uncommon Files |
| .DIESEL | Uncommon Files |
| .DIF | Game Files |
| .DIFF | Uncommon Files |
| .DIG | Audio Files |
| .DIGI | Uncommon Files |
| .DIH | Uncommon Files |
| .DII | Data Files |
| .DIJ | Uncommon Files |
| .DIK | Uncommon Files |
| .DIL | Uncommon Files |
| .DIM | Encoded Files |
| .DIME | Encoded Files |
| .DIN | Uncommon Files |
| .DINERDASHS | Uncommon Files |
| Extension | File Description |
| .DINGBATS | Uncommon Files |
| .DIO | Uncommon Files |
| .DIP | Uncommon Files |
| .DIQ | Uncommon Files |
| .DIR | Video Files |
| .DIRECT | Uncommon Files |
| .DIRECTORY | Settings Files |
| .DIRLIST | Uncommon Files |
| .DIS | Spreadsheet Files |
| .DISAP | Uncommon Files |
| .DISASM | Uncommon Files |
| .DISCO | Web Files |
| .DISHONOR | Uncommon Files |
| .DISK | Disk Image Files |
| .DIST | Text Files |
| .DIST2 | Uncommon Files |
| .DIST4 | Uncommon Files |
| .DISTZ | Data Files |
| .DIT | System Files |
| .DIU | Uncommon Files |
| .DIV | GIS Files |
| .DIVX | Video Files |
| .DIW | Uncommon Files |
| .DIX | GIS Files |
| .DIY | Backup Files |
| .DIZ | Text Files |
| .DI_ | Uncommon Files |
| .DJ0 | Uncommon Files |
| .DJ1 | Uncommon Files |
| .DJ2 | Uncommon Files |
| .DJ3 | Uncommon Files |
| .DJ4 | Uncommon Files |
| .DJ5 | Uncommon Files |
| .DJ6 | Uncommon Files |
| .DJ7 | Uncommon Files |
| .DJ8 | Uncommon Files |
| .DJ9 | Uncommon Files |
| .DJA | Uncommon Files |
| .DJB | Uncommon Files |
| .DJC | Uncommon Files |
| .DJD | Uncommon Files |
| .DJE | Uncommon Files |
| .DJF | Uncommon Files |
| .DJG | Uncommon Files |
| .DJH | Uncommon Files |
| .DJI | Uncommon Files |
| .DJIA | Uncommon Files |
| .DJJ | Uncommon Files |
| .DJK | Uncommon Files |
| .DJL | Uncommon Files |
| .DJM | Uncommon Files |
| .DJN | Uncommon Files |
| .DJO | Uncommon Files |
| .DJP | Uncommon Files |
| .DJQ | Uncommon Files |
| .DJR | Audio Files |
| .DJS | Uncommon Files |
| .DJT | Uncommon Files |
| .DJTA | Uncommon Files |
| .DJU | Uncommon Files |
| .DJUA | Uncommon Files |
| .DJV | Raster Image Files |
| .DJVU | Raster Image Files |
| .DJW | Uncommon Files |
| .DJX | Uncommon Files |
| .DJY | Uncommon Files |
| .DJZ | Uncommon Files |
| .DK | Uncommon Files |
| .DK0 | Uncommon Files |
| .DK1 | Uncommon Files |
| .DK2 | Uncommon Files |
| .DK3 | Uncommon Files |
| .DK4 | Uncommon Files |
| .DK5 | Uncommon Files |
| .DK6 | Uncommon Files |
